Fix window focus after the last commit

Initialize m_disableFocusFromKbd, added by the parent commit, correctly
to "false" and not "true".

See https://github.com/wxWidgets/wxWidgets/pull/1516

src/common/wincmn.cpp

@@ -320,7 +320,7 @@ wxWindowBase::wxWindowBase()
     m_containingSizer = NULL;
     m_autoLayout = false;
 
-    m_disableFocusFromKbd = true;
+    m_disableFocusFromKbd = false;
 
 #if wxUSE_DRAG_AND_DROP
     m_dropTarget = NULL;